RESEARCH ON TRIBOLOGICAL BEHAVIOR OF Cr3C2-25NiCr-COATED BRAKE DISC

2021 ◽  
pp. 2150097
Author(s):  
HALİL KILIÇ ◽  
CENK MISIRLI
Keyword(s):  
Friction And Wear ◽  
Wear Behavior ◽  
Wear Loss ◽  
Brake Disc ◽  
Ceramic Phase ◽  
Friction And Wear Behavior ◽  
The Coefficient Of Friction ◽  
Grey Cast ◽  
Sprayed Coating ◽  
Oxygen Fuel

This research presents the results of a comparative study to determine the friction and wear behavior of the high-velocity oxygen fuel (HVOF)-sprayed Cr3C2-25NiCr-coated brake disc. The friction and wear behavior of Cr3C2-25NiCr-coated brake disc (CD) and the sliding against the commercial brake pad were examined on a laboratory-scale disc-pad dynamometer and the findings were compared with those of reference brake disc (UCD). The coating was deposited by means of the HVOF process on a grey cast iron (GCI) substrate. Braking tests were performed according to the SAE-J2430 test standard. The as-sprayed coating was characterized for their microstructure and phase constitution by SEM/EDS and XRD. The results reveal that the coefficient of friction (COF) of CD and UCD varies between 0.42–0.57 and 0.44–0.62, respectively. The Cr3C2-25NiCr-coated brake disc was found to have exhibited a comparable COF and lower wear loss to the reference brake disc. The addition of a ceramic phase to the brake disc coating played an important role in reducing the COF to an acceptable range and improving the sliding wear resistance of the brake pair.

Friction and Wear Behavior of 45# Steel with Different Plant Abrasive

2013 ◽  
Vol 712-715 ◽  
pp. 74-77
Author(s):  
Chuan Jia Yang ◽  
Xiao Peng Huang ◽  
Jing Feng Wu ◽  
Fang Xin Wan
Keyword(s):  
Electron Microscopy ◽  
Friction And Wear ◽  
Adhesive Wear ◽  
Wear Behavior ◽  
Mechanical Polishing ◽  
Wear Loss ◽  
Dominant Mechanism ◽  
Friction And Wear Behavior ◽  
Worn Surface ◽  
Scanning Electron

The wear behavior of different plant abrasive to 45# steel was studied by using an abrasive rubber wheel tester. The worn surface of the frictional samples morphology was observed by using Scanning Electron Microscopy, and the wearing mechanism of different abrasive to 45# steel was analyzed. The results show that: on the experiment conditions, the wear loss from big to small is alfalfa abrasive, corn abrasive and wheat abrasive, and the wear rules of corn abrasive and wheat abrasive are similar, but the wear loss of alfalfa abrasive is much higher than the former two. The wear dominant mechanism of the wheat abrasive to 45# steel is mechanical polishing, the wear dominant mechanism of the corn abrasive to 45# steel is mechanical polishing and adhesive wear, the wear dominant mechanism of the alfalfa abrasive to 45#steel is micro-cutting and adhesive wear.

Effect of Humidity on the Friction and Wear Properties of Sn

1995 ◽  
Vol 117 (4) ◽  
pp. 737-741 ◽  
Author(s):  
Y. Imada ◽  
K. Nakajima
Keyword(s):  
Relative Humidity ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Disk Surface ◽  
Wear Loss ◽  
Wear Properties ◽  
Friction And Wear Behavior ◽  
Low Humidity ◽  
Friction And Wear Properties ◽  
Pin On Disk

Variation in friction and wear properties with relative humidity was obtained with an Sn pin sample on a Cu disk at a constant speed (0.4 m/s), load (6.4 N), and sliding distance (5 km), using a pin-on-disk apparatus. The influence of atmosphere on the tribological properties was investigated, including moisture ranging from 4% to 95 percent relative humidity (RH). It was found that the wear loss of the pin sample is very large at low humidity of around 5 percent RH, but it decreases and reaches saturation at about 50 percent RH. Factors characterizing the friction and wear at 50 percent RH were examined along with surface analysis of the disk. The results showed that the extensive transfer of Sn from pin to disk occurs during sliding and that the friction and wear behavior is determined by the friction and wear of an Sn sliding on Sn. An examination was carried out with an Sn pin sample on a stainless steel disk in comparison with an Sn-Cu couple. It was concluded that the friction and wear behavior is determined by the properties of the film transferred to the disk surface.

Tribochemistry in sliding wear of TiCN–Ni-based cermets

2008 ◽  
Vol 23 (5) ◽  
pp. 1214-1227 ◽  
Author(s):  
B.V. Manoj Kumar ◽  
Bikramjit Basu ◽  
Joze Vizintin ◽  
Mitjan Kalin
Keyword(s):  
Friction And Wear ◽  
Wear Behavior ◽  
Bearing Steel ◽  
Wear Loss ◽  
Secondary Carbide ◽  
Pronounced Increase ◽  
Friction And Wear Behavior ◽  
Secondary Carbides ◽  
Low Load ◽  
The Stability

The tailoring of cermet composition to improve tribological properties requires careful choice of the type of secondary carbide. To investigate this aspect, a number of sliding tests were carried out on baseline TiCN–20Ni cermet and TiCN–20wt%Ni–10 wt% XC cermets (X = W/Nb/Ta/Hf) at varying loads of 5N, 20N, and 50N against bearing steel. With these experiments, we attempted to answer some of the pertinent issues: (i) how does the type of secondary carbide (WC/NbC/TaC/HfC) influence friction and wear behavior, and is such influence dependent on load?; and (ii) how does the secondary carbide addition affect the stability and composition of the tribochemical layer under the selected sliding conditions? Our experimental results reveal that the added secondary carbides influence chemical interactions between different oxides and such interactions dominate the friction and wear behavior. A higher coefficient of friction (COF) range, varying from 0.75 to 0.64 was recorded at 5N; whereas the reduced COF of 0.46–0.52 was observed at 20N or 50N. The volumetric wear rate decreased with load and varied on the order of 10−6 to 10−7 mm3/Nm for the cermets investigated. The cermet containing HfC exhibited high friction and poor wear resistance. At low load (5N), the abrasion and adhesion of hard debris containing various oxides dominated the wear, and resulted in high friction and wear loss. In contrast, the more pronounced increase in friction-induced contact temperature (below 500 °C) and compaction of hard debris resulted in the formation of a distinct tribochemical layer at higher loads (20N and 50N). The formation of a dense tribolayer containing oxides of iron and/or titanium is responsible for the reduced friction and wear, irrespective of secondary carbides.

Effect of contact temperature, normal load and dry sliding velocity on the coefficient of friction and wear behavior of nickel based super alloy

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Rama Krishna S. ◽  
Patta Lokanadham
Keyword(s):  
Coefficient Of Friction ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Normal Load ◽  
Contact Temperature ◽  
Sliding Velocity ◽  
Friction And Wear Behavior ◽  
Alloy Material ◽  
The Coefficient Of Friction ◽  
Super Alloy

Purpose The purpose of the present paper aims to, study the coefficient of friction and wear behavior of nickel based super alloys used in manufacturing of gas and steam turbine blades. In present paper, parametric study focuses on normal load, dry sliding velocity and contact temperature influence on coefficient of friction and wear of a nickel based super alloy material. Design/methodology/approach Experimental investigation is carried out to know the effect of varying load at constant sliding velocity and varying sliding velocity at constant load on coefficient of friction and wear behavior of nickel based super alloy material. The experiments are carried out on a nickel based super alloy material using pin on disk apparatus by load ranging from 30 N to 90 N and sliding velocity from 1.34 m/s to 2.67 m/s. The contact temperature between pin and disk is measured using K-type thermocouple for all test conditions to know effect of contact temperature on coefficient of friction and wear behavior of nickel based super alloy material. Analytical calculations are carried out to find wear rate and wear coefficient of the test specimen and are compared with experimental results for validation of experimental setup. Regression equations are generated from experimental results to estimate coefficient of friction and wear in the range of test conditions. Findings From the experimental results, it is observed that by increasing the normal load or sliding velocity, the contact temperature between the pin and disk increases, the coefficient of friction decreases and wear increases. Analysis of variance (ANOVA) is used to study the influence of individual parameters like normal load, dry sliding speed and sliding distance on the coefficient of friction and wear of nickel based super alloy material. Originality/value This is the first time to study effect of contact temperature on the coefficient of friction and wear behavior of nickel-based super alloy used for gas and steam turbine blades. Separate regression equations have been developed to determine the coefficient of friction and wear for the entire range of speed of gas turbine blades made of nickel based super alloy. The regression equations are also validated against experimental results.

STUDY ON FRICTION AND WEAR PROPERTIES OF SILVER MATRIX BRUSH MATERIAL WITH DIFFERENT ADDITIVES

2013 ◽  
Vol 27 (19) ◽  
pp. 1341037
Author(s):  
XIAOLI CHEN ◽  
WENFANG WANG ◽  
YU HONG ◽  
YUCHENG WU
Keyword(s):  
Friction And Wear ◽  
Wear Behavior ◽  
Friction Pair ◽  
Critical Value ◽  
Wear Loss ◽  
Wear Properties ◽  
Friction And Wear Behavior ◽  
Comprehensive Performance ◽  
Silver Matrix ◽  
Friction And Wear Properties

Friction and wear processes of AgCuX ( G , CF and AlN ) composites- CuAgV alloy friction pair and effects of different additive content in silver based composite on friction and wear behavior are studied in this paper. The microstructure of the brush wear surface is observed by SEM. The results show that when graphite content is up to 9 wt.%, Ag - Cu - CF - G composite exhibits the best wear properties; when the content of aluminum nitride is up to 0.5 wt.%, Ag - Cu - AlN - G composites has the most comprehensive performance. The wear loss of both composites arises with the increase of both pressure and speed, but when speed reaches a critical value, the increased amplitude of wear loss tends to be steady.

Friction and Wear Behavior of Structural Ceramics Sliding against Bearing Steel under Vacuum Condition

2011 ◽  
Vol 474-476 ◽  
pp. 973-978
Author(s):  
Yong Xing Tong ◽  
Li Qin Wang ◽  
Le Gu ◽  
Bo Peng
Keyword(s):  
Friction And Wear ◽  
Applied Load ◽  
Wear Behavior ◽  
Ceramic Materials ◽  
Bearing Steel ◽  
Operating Conditions ◽  
Vacuum Condition ◽  
Structural Ceramics ◽  
Friction And Wear Behavior ◽  
The Coefficient Of Friction

The friction and wear behavior of Si3N4, SiC and ZrO2 sliding against M50 bearing steel under vacuum condition at various applied load were investigated. The results showed that the properties of different ceramic materials cause the difference in wear behaviors. The coefficient of friction was lowest in SiC and M50 bearing steel couple than other cases for graphitic carbon replaced carbidic carbon at the worn layer of SiC. The specific wear rate of ZrO2 was highest and the lowest was Si3N4. The ceramic ball materials have transferred on M50 bearing steel surfaces and tribofilm consistently formed on the ceramic balls wearing surfaces. Dominant wear behaviors for three structural ceramics were adhesion abrasion, plastic deformation and brittle fracture. The couple with Si3N4 and M50 showed the best operating conditions for friction and wear resistance under higher applied load.

The Effect of Load on Friction and Wear Behavior of NBR and FPM under Dry Sliding

2011 ◽  
Vol 239-242 ◽  
pp. 985-989
Author(s):  
Xiao Ren Lv ◽  
Hao Sun ◽  
Xuan Luo ◽  
Shi Jie Wang
Keyword(s):  
Friction And Wear ◽  
Wear Behavior ◽  
Frictional Coefficient ◽  
Wear Loss ◽  
Dry Sliding ◽  
Shore Hardness ◽  
Friction And Wear Behavior ◽  
Stereo Microscope ◽  
Worn Surface

The effect of load on the friction and wear behavior of NBR and FPM was investigated using a ring-on-block tester under dry sliding. The hardness and morphology of worn surface were measured using Shore Hardness and stereo microscope, respectively. The results showed that at the load of 50, 100 and 150N, the wear loss of NBR was lower than that of FPM and the frictional coefficient of NBR was the same as that of FPM. While at the load of 175, 200 and 225N, the wear loss and frictional coefficient of NBR were higher than that of FPM. The reason for the variation of friction and wear behavior of NBR and FPM under different load was discussed preliminarily.

Friction and wear behavior of pin-bushing with magnetorheological fluids

2017 ◽  
Vol 69 (6) ◽  
pp. 912-918 ◽  
Author(s):  
Peng Zhang ◽  
Gwanghee Lee ◽  
Chulhee Lee ◽  
Hyung Yoon
Keyword(s):  
Magnetic Field ◽  
Coefficient Of Friction ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Magnetorheological Fluids ◽  
Content Type ◽  
Friction And Wear Behavior ◽  
Wear Characteristics ◽  
The Coefficient Of Friction ◽  
Friction And Wear Characteristics

Purpose The purpose of this paper is to carry out research on friction and wear behavior of pin-bushing with magnetorheological fluids (MRFs). Design/methodology/approach The oscillation friction characteristics of MRFs with a magnetic field are evaluated by a pin-bushing friction wear tester. The housing is adjusted to apply the magnetic field to MRFs. Experiments are carried out with and without a magnetic field, and the coefficient of friction and temperature on the contact interface are measured. The surfaces of the pin and bushing are also examined by a surface profilometer and an optical microscope before and after tests. The experiment results show a lower coefficient of friction is observed when a magnetic field is applied. Findings The temperature is lowest when grease is used. The case when a magnetic field is present shows the higher temperature. The coefficient of friction is higher than grease lubrication when an MRF is applied. The coefficient of friction of the pin-bushing is lowest with grease and highest when a magnetic field is present. The friction coefficient of grease and MRFs decreases as the load increases and remains stable after 3 kN is added. The roughness, surface profile and morphology of the pin show the best results when grease is used as compared with MRFs. Originality/value The tribology characteristic of pin-bushing with MRFs shows more deficiency than that with grease. Nevertheless, it is necessary to carry out the research on the friction and wear characteristics of a pin-bushing with MRFs, as it is expected to increase the load-carrying capacity when an MRF is applied to the pin-bush system. Better friction and wear characteristics could be achieved by enhancing the property of MRFs.

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